JP2021176440A - sewing machine - Google Patents

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JP2021176440A
JP2021176440A JP2020082799A JP2020082799A JP2021176440A JP 2021176440 A JP2021176440 A JP 2021176440A JP 2020082799 A JP2020082799 A JP 2020082799A JP 2020082799 A JP2020082799 A JP 2020082799A JP 2021176440 A JP2021176440 A JP 2021176440A
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thread
needle
threading
sewing machine
holding
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JP7481893B2 (en
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浩二 前田
Koji Maeda
潤 真船
Jun Mafune
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Janome Corp
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Janome Sewing Machine Co Ltd
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Abstract

To propose a sewing machine in which a state of sewing a cloth with a needle is easily visible, which can perform sewing work easily, and which can facilitate needle threading work.SOLUTION: A sewing machine includes a needle threading device 9 which includes a first thread holding part h1 and a needle threading hook 17 approaching from one side and the other side of a needle hole 5a respectively, while descending toward the needle hole 5a, in which a needle thread t is inserted into the needle hole 5a by the needle threading hook 17 going through the needle hole 5a and capturing the needle thread t which is held by the first thread holding part h1 that has approached the needle hole 5a. The sewing machine includes a second thread holding part h2 which is provided at a cover 2 for covering the needle threading device 9, and which holds the needle thread t at a needle threading preparation stage. The first thread holding part h1 is not holding the needle thread t at the needle threading preparation stage, and in the middle of the needle threading device 9 descending, it holds the needle thread t and releases the needle thread t from the second thread holding part h2.SELECTED DRAWING: Figure 3

Description

本発明は、針先に設けられた針孔に上糸を通すための糸通し装置を備えるミシンに関する。 The present invention relates to a sewing machine provided with a threading device for threading a needle thread through a needle hole provided at a needle tip.

針先に設けられた針孔に上糸を通すための糸通し装置を備えるミシンとして、例えば下記の特許文献1が知られている。特許文献1の糸通し装置は、同文献の図2、図4に示すように、フック状の部材を針孔に通し、そのフックに上糸を掛けて、フック状の部材を針孔から引き抜くことによって糸通しが行えるように構成されている。しかしこの装置による糸通し作業は、同文献の図2に示されているように、作業者は一方の指で糸を摘まみ、他方の指でレバーを押し下げなければならない。すなわち、糸通し作業にあたって両手を使わなければならず煩わしさがある。 For example, the following Patent Document 1 is known as a sewing machine provided with a threading device for threading a needle thread through a needle hole provided at a needle tip. In the threading device of Patent Document 1, as shown in FIGS. 2 and 4 of the same document, a hook-shaped member is passed through a needle hole, a needle thread is hooked on the hook, and the hook-shaped member is pulled out from the needle hole. It is configured so that threading can be performed. However, in the threading operation by this device, as shown in FIG. 2 of the same document, the operator must pick the thread with one finger and push down the lever with the other finger. That is, it is troublesome to use both hands for threading work.

このような問題点を解消して作業性を向上させた糸通し装置も提案されている。例えば下記の特許文献2においては、同文献の図1〜2、図8〜10等に示されているように、糸通し準備段階で上糸を糸保持機構(70)に掛けておき、操作レバー(47)を押し下げると、これに連動してフック(32)が針孔を通るとともに糸保持機構がフックまで上糸を案内して上糸がフックに捕捉され、その後、操作レバーへの押圧を解除してこれが上方へ移動すると、上糸を捕捉した状態でフックが針孔から抜けるために上糸が糸通しされる。すなわち、特許文献2の糸通し装置においては、操作レバーを操作するのみ、つまり片手で操作するのみで糸通しを行うことができるため、作業性に優れている。 A threading device that solves such a problem and improves workability has also been proposed. For example, in Patent Document 2 below, as shown in FIGS. 1 to 2 and 8 to 10 of the same document, the needle thread is hung on the thread holding mechanism (70) at the threading preparation stage and operated. When the lever (47) is pushed down, the hook (32) passes through the needle hole in conjunction with this, and the thread holding mechanism guides the needle thread to the hook, and the needle thread is caught by the hook, and then pressed against the operation lever. When this is released and this moves upward, the needle thread is threaded because the hook comes out of the needle hole while the needle thread is captured. That is, the threading device of Patent Document 2 is excellent in workability because threading can be performed only by operating the operation lever, that is, by operating it with one hand.

特開平4−64386号公報Japanese Unexamined Patent Publication No. 4-64386 特開2006−158412号公報Japanese Unexamined Patent Publication No. 2006-158412 特開平8−173678号公報Japanese Unexamined Patent Publication No. 8-173678

ところで特許文献2のミシンは、糸保持機構に上糸を掛けるため、同文献の図1〜2に示されているように、糸保持機構がミシンカバー(F)の下面から常時飛び出した状態になっている。このため、針で生地を縫製している状態が見えづらくなる他、針板までの隙間が狭くなって縫製作業が行いにくくなる。 By the way, in the sewing machine of Patent Document 2, since the needle thread is hooked on the thread holding mechanism, the thread holding mechanism is constantly protruding from the lower surface of the sewing machine cover (F) as shown in FIGS. It has become. For this reason, it becomes difficult to see the state in which the fabric is sewn with the needle, and the gap to the needle plate becomes narrow, which makes it difficult to perform the sewing work.

一方、上記特許文献3には、糸通し装置をミシンカバーの内側に収容するとともに、ミシンカバーには内部の糸通し装置に糸掛けを行うための溝を設けたミシンが示されている。しかし、ミシンカバーに溝を設けるということは、内部構造の保護や埃の浸入防止といったカバーの機能を損なうことになる。また単に糸を溝に通しただけでは、溝の内側の糸通し装置に正しく糸が掛かっているかの判別が難しいという問題も抱えている。更にこのミシンも、同文献の図2に示されているように、溝(12)を設けた部位が本来のミシンカバー(2)から下方に飛び出した状態になっているため、特許文献2のミシンが抱えている視認性と作業性の阻害を解決するには至っていない。 On the other hand, Patent Document 3 discloses a sewing machine in which the threading device is housed inside the sewing machine cover and the sewing machine cover is provided with a groove for threading the threading device inside. However, providing a groove in the sewing machine cover impairs the function of the cover such as protection of the internal structure and prevention of dust intrusion. Further, there is a problem that it is difficult to determine whether or not the thread is correctly hooked on the threading device inside the groove simply by passing the thread through the groove. Further, as shown in FIG. 2 of the same document, this sewing machine is also in a state where the portion provided with the groove (12) protrudes downward from the original sewing machine cover (2). It has not been possible to solve the obstacles to the visibility and workability of the sewing machine.

このような問題点に鑑み、本発明は、針で生地を縫製している状態が視認しやすく、また縫製作業も行いやすいうえ、糸通し作業も容易に行えるミシンを提供することを目的とする。 In view of these problems, an object of the present invention is to provide a sewing machine capable of easily recognizing a state in which a fabric is sewn with a needle, easily performing sewing work, and easily performing threading work. ..

本発明は、針の先端に設けられた針孔に向けて下降しつつ当該針孔の一方側と他方側からそれぞれ接近する第一糸保持部と糸通しフックとを備え、当該糸通しフックが当該針孔を挿通し、当該針孔に接近した当該第一糸保持部が保持する上糸を捕捉することによって、当該上糸を当該針孔へ挿通させる糸通し装置を備えるミシンであって、前記糸通し装置を覆うカバーに設けられ、糸通し準備段階において前記上糸を保持する第二糸保持部を備え、前記第一糸保持部は、前記糸通し準備段階において前記上糸を保持しておらず、前記糸通し装置が下降する途中において、前記上糸を保持するとともに前記第二糸保持部から当該上糸を解放するように構成されている。 The present invention includes a first thread holding portion and a threading hook that approach each other from one side and the other side of the needle hole while descending toward the needle hole provided at the tip of the needle. A sewing machine provided with a threading device for inserting the needle hole into the needle hole by inserting the needle hole and capturing the needle thread held by the first thread holding portion approaching the needle hole. A second thread holding portion provided on a cover covering the threading device and holding the needle thread in the threading preparation stage is provided, and the first thread holding portion holds the needle thread in the threading preparation stage. The needle threader is configured to hold the needle thread and release the needle thread from the second thread holding portion while the threading device is descending.

このようなミシンにおいて、前記第一糸保持部は、支持体と、該支持体から離間する開放状態と該支持体に接近して前記上糸を挟持可能な挟持状態とに変位する第一糸保持体を備え、前記第一糸保持体は、前記糸通し装置の下降に伴い前記開放状態から前記挟持状態へ変位することが好ましい。 In such a sewing machine, the first thread holding portion is displaced to a support, an open state separated from the support, and a holding state in which the needle thread can be sandwiched by approaching the support. It is preferable that the first thread holding body is provided with a holding body, and the first thread holding body is displaced from the open state to the holding state as the threading device is lowered.

また前記第一糸保持部は、前記糸通し装置の下降に伴い前記上糸に接触する糸掛けアームを備え、前記糸掛けアームと前記挟持状態へ変位した前記第一糸保持体とが協働して前記上糸に水平部を形成するように構成することが好ましい。 Further, the first thread holding portion includes a thread hooking arm that comes into contact with the needle thread as the threading device descends, and the thread hooking arm and the first thread holding body displaced to the holding state cooperate with each other. Therefore, it is preferable to form the needle thread so as to form a horizontal portion.

そして、前記糸通し装置は、前記第一糸保持部を回動させる回動部を備え、前記第一糸保持部を下降且つ回動させることによって、前記水平部を前記針孔に対向する位置に移動させることが好ましい。 Then, the threading device includes a rotating portion for rotating the first thread holding portion, and by lowering and rotating the first thread holding portion, the horizontal portion faces the needle hole. It is preferable to move to.

前記第二糸保持部が前記上糸を保持する保持力は、前記第一糸保持部が当該上糸を保持する保持力よりも弱く設定されていることが好ましい。 It is preferable that the holding force of the second thread holding portion for holding the needle thread is set to be weaker than the holding force of the first thread holding portion for holding the needle thread.

本発明のミシンでは、糸通し装置が備える第一糸保持部と糸通しフックとによって上糸を針孔に挿通させることができるため、糸通し作業を容易に行うことができる。また糸通し装置を覆うミシンカバーに、糸通し準備段階において上糸を保持する第二糸保持部を設けていて、上述した第一糸保持部は、糸通しを行うにあたって針孔に向けて下降する途中で、上糸を挟持して保持するとともに第二糸保持部から上糸を解放する一方、糸通し準備段階を含め糸通し装置の不使用状態においては上糸を保持せず上方に位置している。すなわち、縫製時において針周辺は遮られることはなく、縫製状態が視認しやすくなり作業性が向上する。 In the sewing machine of the present invention, the needle thread can be inserted into the needle hole by the first thread holding portion and the threading hook provided in the threading device, so that the threading operation can be easily performed. Further, the sewing machine cover covering the threading device is provided with a second thread holding portion for holding the needle thread in the threading preparation stage, and the first thread holding portion described above is lowered toward the needle hole when threading. While the needle thread is pinched and held and the needle thread is released from the second thread holding portion during the process, the needle thread is not held and is positioned upward when the threading device is not in use, including the threading preparation stage. doing. That is, the periphery of the needle is not obstructed during sewing, the sewn state is easily visible, and workability is improved.

本発明に係るミシンの一実施形態を示した外観図である。It is an external view which showed one Embodiment of the sewing machine which concerns on this invention. 図1に示したミシンにおいて、面板を取り外して内部の糸通し装置と針駆動装置を示した斜視図である。FIG. 3 is a perspective view showing a threading device and a needle driving device inside the sewing machine shown in FIG. 1 with the face plate removed. 図2における糸通し装置と針駆動装置の分解斜視図である。It is an exploded perspective view of the threading device and the needle driving device in FIG. 2. 支持体の先端部周辺を示した部分拡大斜視図であって、(a)は上糸を保持する前の状態であり、(b)は上糸を保持した後の状態である。It is a partially enlarged perspective view which showed the periphery of the tip part of the support, (a) is the state before holding the needle thread, and (b) is the state after holding a needle thread. 糸通し装置による糸通し動作に関する説明図である。It is explanatory drawing about the threading operation by a threading device. 図5に示す状態に引き続いて行われる糸通し装置による糸通し動作に関する説明図である。It is explanatory drawing about the threading operation by the threading apparatus performed following the state shown in FIG. 図6に示す状態に引き続いて行われる糸通し装置による糸通し動作に関する説明図である。It is explanatory drawing about the threading operation by the threading apparatus performed following the state shown in FIG. 図7に示す状態に引き続いて行われる糸通し装置による糸通し動作に関する説明図である。It is explanatory drawing about the threading operation by the threading apparatus performed following the state shown in FIG. 7. 図8に示す状態に引き続いて行われる糸通し装置による糸通し動作に関する説明図である。It is explanatory drawing about the threading operation by the threading apparatus performed following the state shown in FIG.

以下、図面を参照しながら、本発明に係るミシンの一実施形態について説明する。なお以下の説明におけるX、Y、Z方向とは、図面に示した矢印X、Y、Zに沿う方向であってミシン1を正面から見た際の左右方向をX方向、奥行き方向(前後方向)をY方向、高さ方向(上下方向)をZ方向とする。 Hereinafter, an embodiment of the sewing machine according to the present invention will be described with reference to the drawings. The X, Y, and Z directions in the following description are directions along the arrows X, Y, and Z shown in the drawings, and the left and right directions when the sewing machine 1 is viewed from the front are the X direction and the depth direction (front-back direction). ) Is the Y direction, and the height direction (vertical direction) is the Z direction.

図1に示すように本実施形態のミシン1は、その全体を覆う外装部材であるミシンカバー2を備えている。本実施形態のミシンカバー2は、主にミシン1の右側部分と中央部分を覆うミシンカバー本体2aと、主にミシン1の左側部分を覆う面板2bとを備えていて、ミシンカバー本体2aと面板2bの境界付近には、溝状の糸道2cが設けられている。ミシンカバー2の右側上方には、糸駒sを支持する糸駒支持部3が設けられていて、ミシンカバー2の左側下方には、針棒糸掛け部4、針5(先端に針孔5aが設けられている)、糸掛けばね6(図2参照)、及びレバー7の下部(後述する押圧部7a)が、面板2bから露出する状態で設けられている。なお本実施形態の糸掛けばね6は、図示したように面板2bの下面に対してその一端部がねじ等で固定されていて、糸駒sからの上糸tを、他端部と面板2bで挟持することができる。また図示は省略するが、糸掛けばね6の近傍には、上糸tをカットするための糸切り刃が設けられている。 As shown in FIG. 1, the sewing machine 1 of the present embodiment includes a sewing machine cover 2 which is an exterior member that covers the entire sewing machine 1. The sewing machine cover 2 of the present embodiment mainly includes a sewing machine cover main body 2a that covers the right side portion and the central portion of the sewing machine 1, and a face plate 2b that mainly covers the left side portion of the sewing machine 1. The sewing machine cover main body 2a and the face plate. A groove-shaped thread path 2c is provided near the boundary of 2b. A thread piece support portion 3 for supporting the thread piece s is provided on the upper right side of the sewing machine cover 2, and a needle bar thread hooking portion 4 and a needle 5 (needle hole 5a at the tip) are provided on the lower left side of the sewing machine cover 2. Is provided), the thread hook spring 6 (see FIG. 2), and the lower portion of the lever 7 (pressing portion 7a described later) are provided so as to be exposed from the face plate 2b. As shown in the figure, one end of the thread hook spring 6 of the present embodiment is fixed to the lower surface of the face plate 2b with a screw or the like, and the upper thread t from the thread piece s is connected to the other end and the face plate 2b. Can be sandwiched between. Although not shown, a thread trimming blade for cutting the needle thread t is provided in the vicinity of the thread hook spring 6.

ミシン1により布を縫製するにあたり、作業者は、その準備段階として糸駒sから上糸tを引出して針孔5aに挿通させる糸掛け動作を行う必要がある。詳細については後述するが、本実施形態のミシン1では、作業者が糸駒sからの上糸tを糸道2cに通し、更に針棒糸掛け部4に掛けた後、糸掛けばね6と面板2bで挟み込むようにしてこれを保持させて糸掛け動作が行われる。なお以下の説明では、糸掛けばね6と面板2bをまとめて第二糸保持部h2と称する。その後はレバー7を押し下げると、後述する針駆動装置8に糸通し装置9が作用して、上糸tを針孔5aに自動的に挿通させることができる。 When sewing the cloth with the sewing machine 1, the operator needs to perform a thread hooking operation of pulling out the needle thread t from the thread piece s and inserting it into the needle hole 5a as a preparatory step. Although the details will be described later, in the sewing machine 1 of the present embodiment, after the operator passes the needle thread t from the thread piece s through the thread path 2c and further hangs it on the needle bar thread hooking portion 4, the thread hooking spring 6 is used. The thread hooking operation is performed by sandwiching the face plate 2b and holding the face plate 2b. In the following description, the thread hook spring 6 and the face plate 2b are collectively referred to as a second thread holding portion h2. After that, when the lever 7 is pushed down, the threading device 9 acts on the needle driving device 8 described later, and the needle thread t can be automatically inserted into the needle hole 5a.

ここで針駆動装置8の構成について、図2、図3を参照しながら詳細に説明する。なお図3の分解斜視図は、各部の連係を説明するためのものであって、組み立て手順を厳密に示したものではなく、組み立て時に後から取り付ける部材を先に取り付けて示した箇所がある。 Here, the configuration of the needle driving device 8 will be described in detail with reference to FIGS. 2 and 3. It should be noted that the exploded perspective view of FIG. 3 is for explaining the linkage of each part, and does not show the assembly procedure exactly, but there is a part where the member to be attached later at the time of assembly is attached first.

本実施形態の針駆動装置8は、下端部に針棒糸掛け部4を保持するとともに針棒糸掛け部4の下方に針5を保持する針棒10と、針棒10を上下方向にスライド可能に支持する針棒支持体11と、針棒10の中間部に固定される糸通し位置決め板12とを備えている。本実施形態の針棒支持体11は、所定の形状になる板金を折り曲げて形成されたものであって、その上部には針棒支持体11をY方向に貫通する円形の軸孔11aが設けられている。また針棒支持体11の中間部には、これをY方向に貫通する振幅連結部11bが設けられている。そして針棒支持体11の左側面には、平面状になる位置決め部(針駆動装置側位置決め部)11cが設けられている。また糸通し位置決め板12は、X方向に延在する突出部12aと、突出部12aの上方であってその根元側に位置する溝部12bとを備えている。 The needle driving device 8 of the present embodiment has a needle rod 10 that holds the needle bar thread hooking portion 4 at the lower end and holds the needle 5 below the needle bar thread hooking portion 4, and slides the needle bar 10 in the vertical direction. It includes a needle bar support 11 that can support the needle bar, and a threading positioning plate 12 that is fixed to an intermediate portion of the needle bar 10. The needle bar support 11 of the present embodiment is formed by bending a sheet metal having a predetermined shape, and a circular shaft hole 11a penetrating the needle bar support 11 in the Y direction is provided on the upper portion thereof. Has been done. Further, in the intermediate portion of the needle bar support 11, an amplitude connecting portion 11b that penetrates the needle rod support 11 in the Y direction is provided. A flat positioning portion (needle drive device side positioning portion) 11c is provided on the left side surface of the needle bar support 11. Further, the threading positioning plate 12 includes a protruding portion 12a extending in the X direction and a groove portion 12b above the protruding portion 12a and located on the root side thereof.

本実施形態の針駆動装置8は、針5を上下運動させる機構として、不図示のモータによって回転する上軸13と、上軸13と針棒10との間に設けられるとともに、上軸の回転運動を往復直線運動に変換するクランク部14とを備えていて、モータの回転によって針棒10が上下方向に移動して針5を上下運動させることができる。なお、ミシンアーム15は、ミシンの骨格にあたるフレーム部材である。 The needle driving device 8 of the present embodiment is provided between the upper shaft 13 rotated by a motor (not shown), the upper shaft 13 and the needle rod 10 as a mechanism for moving the needle 5 up and down, and the rotation of the upper shaft. It is provided with a crank portion 14 that converts the motion into a reciprocating linear motion, and the needle rod 10 can be moved in the vertical direction by the rotation of the motor to move the needle 5 up and down. The sewing machine arm 15 is a frame member that corresponds to the skeleton of the sewing machine.

また針駆動装置8は、針5を左右に揺動運動させる機構として、ミシンアーム15からY方向に突出する円柱状の軸16と、振幅連結部11bに連結する不図示の振幅機構を備えている。軸16は、針棒支持体11の軸孔11aを挿通して針棒支持体11を回転可能に支持するものであって、振幅機構を駆動させると、針棒支持体11は軸16を中心に左右に揺動運動するため、針棒支持体11に支持された針棒10を介して針5も左右に揺動運動する。このような針5の上下運動による縫目形成と針5の揺動運動を組み合わせることで、ジグザグ縫いや模様縫い、文字縫い等を行うことができる。なお軸16は、糸通し装置9を回転可能に支持し、これにより後述する第一糸保持部h1を回動させるものでもあるため、本明細書等においては軸16を「回動部」と称することもある。 Further, the needle driving device 8 includes a columnar shaft 16 projecting from the sewing machine arm 15 in the Y direction and an amplitude mechanism (not shown) connected to the amplitude connecting portion 11b as a mechanism for swinging the needle 5 left and right. There is. The shaft 16 rotatably supports the needle bar support 11 through the shaft hole 11a of the needle bar support 11, and when the amplitude mechanism is driven, the needle bar support 11 is centered on the shaft 16. In order to swing left and right, the needle 5 also swings left and right via the needle bar 10 supported by the needle bar support 11. By combining the stitch formation by the vertical movement of the needle 5 and the swinging movement of the needle 5, zigzag sewing, pattern sewing, character sewing and the like can be performed. Since the shaft 16 rotatably supports the threading device 9 and thereby rotates the first thread holding portion h1 described later, the shaft 16 is referred to as a "rotating portion" in the present specification and the like. Sometimes referred to.

糸通し装置9は、図3の部分拡大図に示すように、下方を開放した鉤状の糸通しフック17を備えている。詳細については後述するが、糸通しフック17は、針孔5aに挿入された後に上糸tを捕捉し、その後に針孔5aから抜けることで上糸tを針孔5aに挿通させるものである。糸通しフック17は、図3に示した糸通し体18の一端部(図3では左右方向の一端部)に設けられている。糸通し体18は糸通し軸19に固定されるものであって、本実施形態では図3に示すように、その左右方向他端部が糸通し軸19の下端部に固定されている。糸通し軸19は、支持体20に対して上下方向にスライド可能、且つ糸通し軸19の軸線回りに回転可能に支持されるものであって、本実施形態では概略円柱状に形成されている。支持体20は、支持体台部21に対して上下方向にスライド可能に支持されるものであり、支持体台部21は軸16に回転可能に支持されるものである。 As shown in the partially enlarged view of FIG. 3, the threading device 9 includes a hook-shaped threading hook 17 having an open bottom. Although the details will be described later, the threading hook 17 captures the needle thread t after being inserted into the needle hole 5a, and then pulls out of the needle hole 5a to insert the needle thread t into the needle hole 5a. .. The threading hook 17 is provided at one end of the threading body 18 shown in FIG. 3 (one end in the left-right direction in FIG. 3). The threading body 18 is fixed to the threading shaft 19, and in the present embodiment, the other end in the left-right direction is fixed to the lower end of the threading shaft 19 as shown in FIG. The threading shaft 19 is slidable in the vertical direction with respect to the support 20 and is rotatably supported around the axis of the threading shaft 19, and is formed in a substantially columnar shape in the present embodiment. .. The support 20 is slidably supported in the vertical direction with respect to the support base 21, and the support base 21 is rotatably supported by the shaft 16.

上述した、糸通し軸19が支持体20に対して上下方向にスライド可能且つ回転可能に支持される機構として、本実施形態の支持体20は、糸通し軸19を支持する円形の孔を設けた上側軸受け部20aと下側軸受け部20bを備えている(図3におけるA矢視図を参照)。なお、図3に示すように糸通し軸19には第一圧縮ばね22が設けられていて、糸通し軸19が支持体20に支持された際、第一圧縮ばね22は、下側軸受け部20bの下面と糸通し体18の上面との間に介在して、糸通し体18を、支持体20から離間させる方向に付勢している。また糸通し軸19が支持体20に支持された際、糸通し軸19に取り付けられる止め輪23は、下側軸受け部20bの上面に接する位置にあって、支持体20に対して糸通し軸19を抜け止め保持している。 As the mechanism for supporting the threading shaft 19 so as to be slidable and rotatably with respect to the support 20 as described above, the support 20 of the present embodiment is provided with a circular hole for supporting the threading shaft 19. It is provided with an upper bearing portion 20a and a lower bearing portion 20b (see the view taken along the line A in FIG. 3). As shown in FIG. 3, the threading shaft 19 is provided with the first compression spring 22, and when the threading shaft 19 is supported by the support 20, the first compression spring 22 is the lower bearing portion. The threading body 18 is urged in a direction to be separated from the support 20 by interposing between the lower surface of the 20b and the upper surface of the threading body 18. Further, when the threading shaft 19 is supported by the support 20, the retaining ring 23 attached to the threading shaft 19 is located at a position in contact with the upper surface of the lower bearing portion 20b, and the threading shaft is in contact with the support 20. 19 is held in place.

そして支持体台部21が軸16に回転可能に支持される機構として、本実施形態の支持体台部21は、軸16を挿通させることが可能であって、その上部に設けたコ字状の折り曲げ部を貫通する円形の軸孔21bを備えている。 As a mechanism in which the support base portion 21 is rotatably supported by the shaft 16, the support base portion 21 of the present embodiment is capable of inserting the shaft 16 and has a U-shape provided above the shaft 16. It is provided with a circular shaft hole 21b that penetrates the bent portion of the above.

また糸通し軸19は、図3においてY方向に突出する円柱状の糸通しピン(正面側糸通しピン19aと背面側糸通しピン19b)を備えている。正面側糸通しピン19aは、支持体台部21を厚み方向に貫通するとともにその長手方向に沿って延在するスリット部21aに挿通され、更に支持体20に設けられたカム孔20cに挿通されるものである。本実施形態のカム孔20cは、図3の部分拡大図に示すように正面視において概略三角形状をなすものであって、直線状に延在する上側内面20c1と、下側内面20c2と、左側内面20c3とを備えている。また上側内面20c1と下側内面20c2は、左から右に向かうにつれて上方から下方に向けて傾斜するものである。そして背面側糸通しピン19bは、詳細については後述するが、糸通し位置決め板12の突出部12aと溝部12bに連係するものである。 Further, the threading shaft 19 includes a columnar threading pin (front side threading pin 19a and back side threading pin 19b) protruding in the Y direction in FIG. The front threading pin 19a penetrates the support base portion 21 in the thickness direction, is inserted into the slit portion 21a extending along the longitudinal direction thereof, and is further inserted into the cam hole 20c provided in the support 20. It is a thing. As shown in the partially enlarged view of FIG. 3, the cam hole 20c of the present embodiment has a substantially triangular shape in a front view, and has an upper inner surface 20c1 extending linearly, a lower inner surface 20c2, and a left side. It has an inner surface of 20c3. Further, the upper inner surface 20c1 and the lower inner surface 20c2 are inclined from the upper side to the lower side from the left to the right. The back-side threading pin 19b is linked to the protruding portion 12a and the groove portion 12b of the threading positioning plate 12, which will be described in detail later.

そして支持体20には、図3においてX方向を中心として回転可能な糸保持板24が取り付けられている。なお糸保持板24は、本明細書等において「第一糸保持体」と称することもある。糸保持板24は、図4(a)に示すようにYZ平面とZX平面に対して平行になるように延在して平面視でL字状になるものであって、不図示のねじりばねによって、その先端部24aが支持体20の背面部20dに押し付けられる向きに付勢されている。なお糸保持板24には、Y方向に突出する凸部24bが設けられていて、図4(a)に示す状態(後述する糸通し体18が待機位置にある状態)では、凸部24bが支持体台部21に当接して付勢された方向への回転が阻害されるため、先端部24aと背面部20dとの間には隙間があいている(開放状態)。また支持体20には、X方向に突出する突起状の糸掛けアーム20eと、糸掛けアーム20eの下方においてX方向に延在する糸保持溝20fとが設けられている。なお後述するように、支持体20の背面部20d、糸掛けアーム20e、糸保持溝20f、及び糸保持板24は、糸通し動作の途中段階で上糸tを保持するものであり、以下の説明では背面部20d、糸掛けアーム20e、糸保持溝20f、及び糸保持板24をまとめて、第一糸保持部h1と称する。 A thread holding plate 24 that can rotate around the X direction in FIG. 3 is attached to the support 20. The thread holding plate 24 may be referred to as a "first thread holding body" in the present specification and the like. As shown in FIG. 4A, the thread holding plate 24 extends so as to be parallel to the YZ plane and the ZX plane and has an L-shape in a plan view, and is a torsion spring (not shown). The tip portion 24a is urged so as to be pressed against the back surface portion 20d of the support 20. The thread holding plate 24 is provided with a convex portion 24b protruding in the Y direction, and in the state shown in FIG. 4A (a state in which the threading body 18 described later is in the standby position), the convex portion 24b is provided. Since the rotation in the urged direction in contact with the support base portion 21 is hindered, there is a gap between the front end portion 24a and the back surface portion 20d (open state). Further, the support 20 is provided with a protruding thread hooking arm 20e protruding in the X direction and a thread holding groove 20f extending in the X direction below the thread hooking arm 20e. As will be described later, the back surface portion 20d of the support body 20, the thread hook arm 20e, the thread holding groove 20f, and the thread holding plate 24 hold the needle thread t in the middle of the threading operation, and are described below. In the description, the back surface portion 20d, the thread hook arm 20e, the thread holding groove 20f, and the thread holding plate 24 are collectively referred to as the first thread holding portion h1.

なお、機能については後述するが、支持体20には、図4(a)に示すように上下方向に延在する平坦な針受け面20gと、糸保持溝20fを横切るとともにY方向に延在する挿通孔20hと、図3に示すように支持体20の表面に設けられる第一カム部20jと、支持体20の右側に位置する平面状の位置決め部(糸通し側位置決め部)20kが設けられている。 Although the function will be described later, the support 20 has a flat needle receiving surface 20g extending in the vertical direction and a thread holding groove 20f extending in the Y direction as shown in FIG. 4A. The insertion hole 20h is provided, the first cam portion 20j provided on the surface of the support 20 as shown in FIG. 3, and the planar positioning portion (threading side positioning portion) 20k located on the right side of the support 20 are provided. Has been done.

更に糸通し装置9は、図3に示したスライド台部25、引張ばね26、上述したレバー7の他、図5に示した第二圧縮ばね(付勢部材)27を備えている。 Further, the threading device 9 includes a slide base portion 25 shown in FIG. 3, a tension spring 26, a lever 7 described above, and a second compression spring (urging member) 27 shown in FIG.

スライド台部25は、所定の形状になる板金を折り曲げて形成されたものであって、図3に示すようにねじ等によって、ミシンアーム15と、ミシンアーム15に対して不動となるブラケット28に固定される。スライド台部25は、その長手方向に沿って延在する矩形状のスライド孔25aと、引張ばね26の一端部(上端部)を引っ掛けるばね掛け部25bとを備えていて、更に図3のB矢視図に示すように、スライド台部25の側部に位置して上下方向に延在する平面状の第二カム部25cを備えている。なお第二カム部25cは、上述した第一カム部20jに当接するものである。 The slide base portion 25 is formed by bending a sheet metal having a predetermined shape, and as shown in FIG. 3, the slide base portion 25 is attached to the sewing machine arm 15 and the bracket 28 which is immovable with respect to the sewing machine arm 15 by a screw or the like. It is fixed. The slide base portion 25 includes a rectangular slide hole 25a extending along the longitudinal direction thereof, and a spring hooking portion 25b for hooking one end (upper end) of the tension spring 26, and further includes B in FIG. As shown in the arrow view, a flat second cam portion 25c located on the side portion of the slide base portion 25 and extending in the vertical direction is provided. The second cam portion 25c is in contact with the first cam portion 20j described above.

レバー7は、その下部に位置していて、図1に示すようにミシン1として組み立てられた状態で面板2bから露出し、作業者が糸通し動作を行う際に指で押圧するために使用される板状の押圧部7aと、その上部背面側に設けられている溝状の支持体連結部7bを備えている。ここで上述した支持体20の表面側には、Y方向に突出する円柱状のレバー連結部20mが設けられていて、支持体連結部7bは、その内側にレバー連結部20mが嵌まる形状で形成されている。なお、溝状の支持体連結部7bはX方向に沿って延在する形状となるものであって、レバー連結部20mは、上下方向においては支持体連結部7bに対して不動となるように嵌合するものの、左右方向には多少移動する(遊びを有している)。更にレバー7は、その上部に位置するとともにY方向に突出する円柱状のばね受け部7cを備えている。ばね受け部7cは、スライド孔25aを挿通した後、引張ばね26の他端部(下端部)を引っ掛けるものであって、これによりレバー7は、引張ばね26により上方に付勢される。 The lever 7 is located below the lever 7 and is exposed from the face plate 2b in a state of being assembled as a sewing machine 1 as shown in FIG. 1, and is used for the operator to press with a finger when performing a threading operation. It is provided with a plate-shaped pressing portion 7a and a groove-shaped support connecting portion 7b provided on the upper back side thereof. Here, on the surface side of the support 20 described above, a columnar lever connecting portion 20m protruding in the Y direction is provided, and the support connecting portion 7b has a shape in which the lever connecting portion 20m fits inside. It is formed. The groove-shaped support connecting portion 7b has a shape extending along the X direction, and the lever connecting portion 20m is immovable with respect to the support connecting portion 7b in the vertical direction. Although it fits, it moves slightly in the left-right direction (has play). Further, the lever 7 is provided with a columnar spring receiving portion 7c located above the lever 7 and projecting in the Y direction. The spring receiving portion 7c hooks the other end portion (lower end portion) of the tension spring 26 after inserting the slide hole 25a, whereby the lever 7 is urged upward by the tension spring 26.

第二圧縮ばね27は、図5に示すように、軸16によって回転可能に支持される支持体台部21を針駆動装置8に向けて付勢するものである。第二圧縮ばね27は、例えばミシンアーム15に連結する固定部と支持体台部21の左側側面との間に圧縮された状態で配置されるものであって、元の長さに復元する際の付勢力によって、支持体台部21を針駆動装置8に向けて付勢している。 As shown in FIG. 5, the second compression spring 27 urges the support base portion 21 rotatably supported by the shaft 16 toward the needle drive device 8. The second compression spring 27 is arranged in a compressed state between the fixed portion connected to the sewing machine arm 15 and the left side surface of the support base portion 21, for example, and is restored to the original length. The support base portion 21 is urged toward the needle driving device 8 by the urging force of.

次に、本実施形態のミシン1での糸通し動作について、図5〜図9を参照しながら説明する。なお第一カム部20jと第二カム部25cとの連係状態を説明するため、図5〜図9においては第二カム部25cを概略的に示している。 Next, the threading operation of the sewing machine 1 of the present embodiment will be described with reference to FIGS. 5 to 9. In order to explain the state of cooperation between the first cam portion 20j and the second cam portion 25c, the second cam portion 25c is schematically shown in FIGS. 5 to 9.

まず、糸通し動作を行うための準備として行われる糸掛け動作について、図1、図5を参照しながら説明する。作業者は、ミシン1にセットされた糸駒sから上糸tを引出してこれを糸道2cに通し、針棒糸掛け部4に掛けた後、糸掛けばね6に引っ掛けるようにして糸掛けばね6と面板2bとで上糸tを挟み込む。これにより上糸tは、糸掛けばね6と面板2bで構成される第二糸保持部h2で保持される。糸掛けばね6の近傍には不図示の糸切り刃が設けられていて、上糸tを糸掛けばね6に引っ掛ける際にこれをカットすることができるため、図5の部分拡大図に示したように残糸長さ(糸掛けばね6からカットした端部までの上糸tの長さ)を短くすることができる。つまり、図1及び図5は糸掛け動作が完了した状態(糸通し準備段階)を示している。そしてこの状態において、第一糸保持部h1は、図示したように上糸tの直上に位置している。また糸保持板24は、凸部24bが支持体台部21に当接しているため、先端部24aと背面部20dとの間には隙間があいている。また糸通し装置9は、第二圧縮ばね27の付勢力によって針駆動装置8に向けて付勢されているものの、図示したように糸通し準備段階では、第一カム部20jが第二カム部25cに当接していて、針駆動装置8と糸通し装置9は離間した状態にある。なお図5は、レバー7が押し下げられておらず支持体20が最も上方に位置する状態を示しており、このときの支持体20(糸通し装置9)の位置を待機位置と称する。また以下の説明のため、支持体20が待機位置からどれだけ降下したか、つまりレバー7の押し下げ量を、レバー7に連結するレバー連結部20mの位置を基準として、図中、符合Lで示す。 First, the threading operation performed as a preparation for performing the threading operation will be described with reference to FIGS. 1 and 5. The operator pulls out the needle thread t from the thread piece s set in the sewing machine 1, passes it through the thread path 2c, hooks it on the needle bar thread hooking portion 4, and then hooks it on the thread hooking spring 6. The needle thread t is sandwiched between the spring 6 and the face plate 2b. As a result, the needle thread t is held by the second thread holding portion h2 composed of the thread hook spring 6 and the face plate 2b. A thread trimming blade (not shown) is provided in the vicinity of the thread hook spring 6, and this can be cut when the needle thread t is hooked on the thread hook spring 6, and is therefore shown in the partially enlarged view of FIG. As described above, the remaining thread length (the length of the needle thread t from the thread hook spring 6 to the cut end) can be shortened. That is, FIGS. 1 and 5 show a state in which the threading operation is completed (threading preparation stage). In this state, the first yarn holding portion h1 is located directly above the needle yarn t as shown in the figure. Further, in the thread holding plate 24, since the convex portion 24b is in contact with the support base portion 21, there is a gap between the front end portion 24a and the back surface portion 20d. Further, although the threading device 9 is urged toward the needle driving device 8 by the urging force of the second compression spring 27, as shown in the drawing, in the threading preparation stage, the first cam portion 20j is the second cam portion. The needle driving device 8 and the threading device 9 are in contact with the 25c and are separated from each other. Note that FIG. 5 shows a state in which the lever 7 is not pushed down and the support 20 is located at the uppermost position, and the position of the support 20 (threading device 9) at this time is referred to as a standby position. Further, for the following explanation, how much the support 20 has descended from the standby position, that is, the amount of pushing down of the lever 7 is indicated by the symbol L in the figure with reference to the position of the lever connecting portion 20 m connected to the lever 7. ..

糸掛け動作が完了した後は、作業者がレバー7を押し下げることによって糸通し動作が行われる。図6(a)は、図5に示した状態(レバー7の高さがLの状態)からレバー7を距離S2分、押し下げた状態を概略的に示している。レバー7が押し下げられ、それに伴って支持体20も下降するため、上糸tは、糸保持板24の先端部24aと支持体20の背面部20dとの隙間に侵入する。また支持体20の下降に伴って、支持体台部21が凸部24bから離反して糸保持板24は背面部20dに向けて回転可能となる(挟持状態)。上述したように糸保持板24は、不図示のねじりばねによって背面部20dに向けて付勢されているため、糸保持板24は支持体20の背面部20dに向けて回転し、上糸tは先端部24aと背面部20dによって挟持され保持される。またこのとき上糸tは、図4(b)に示すように糸掛けアーム20eにも接触して捕捉され、糸保持溝20fへと案内される。これら支持体20、糸保持板24、糸掛けアーム20e、及び糸保持溝20fによって上糸tは、糸保持板24と糸掛けアーム20eとの間で水平部t1が形成されるように掛け渡されて(本実施形態では更に糸保持溝20fに侵入した状態で)保持される。なお、上糸tの「水平部」とは、上糸tの一部が厳密に水平方向に延在している、ということを意味するものではなく、後述するように糸通しフック17が捕捉できるように糸通しフック17と交差可能な角度であれば水平に限らない。またこの状態で上糸tは、図6(a)に示すように、糸保持板24等により構成される第一糸保持部h1で保持されるとともに、糸掛けばね6等で構成される第二糸保持部h2でも保持される。なお、第二糸保持部h2で上糸tを保持する保持力(面板2bに対して上糸tを押し付ける糸掛けばね6の付勢力)は、第一糸保持部h1で上糸tを保持する保持力(糸保持板24を背面部20dに向けて回転させる不図示のねじりばねの付勢力)よりも弱くなっている。すなわち、第一糸保持部h1よりも第二糸保持部h2からの方が上糸tは外れやすくなっている。 After the threading operation is completed, the threading operation is performed by the operator pushing down the lever 7. FIG. 6A schematically shows a state in which the lever 7 is pushed down by a distance S2 minutes from the state shown in FIG. 5 (the state in which the height of the lever 7 is L). Since the lever 7 is pushed down and the support 20 is lowered accordingly, the needle thread t enters the gap between the tip 24a of the thread holding plate 24 and the back surface 20d of the support 20. Further, as the support 20 descends, the support base 21 separates from the convex portion 24b, and the thread holding plate 24 becomes rotatable toward the back surface 20d (holding state). As described above, since the thread holding plate 24 is urged toward the back surface 20d by a torsion spring (not shown), the thread holding plate 24 rotates toward the back surface 20d of the support 20 and the needle thread t Is sandwiched and held by the front end portion 24a and the back surface portion 20d. At this time, the needle thread t also contacts and is captured by the thread hooking arm 20e as shown in FIG. 4B, and is guided to the thread holding groove 20f. The needle thread t is hung by the support 20, the thread holding plate 24, the thread hooking arm 20e, and the thread holding groove 20f so that the horizontal portion t1 is formed between the thread holding plate 24 and the thread hooking arm 20e. It is held (in the present embodiment, in a state where it further penetrates into the thread holding groove 20f). The "horizontal portion" of the needle thread t does not mean that a part of the needle thread t extends exactly in the horizontal direction, and the threading hook 17 captures the needle thread t as described later. The angle is not limited to horizontal as long as it can intersect the threading hook 17 as much as possible. Further, in this state, as shown in FIG. 6A, the needle thread t is held by the first thread holding portion h1 composed of the thread holding plate 24 and the like, and the needle thread t is held by the thread hooking spring 6 and the like. It is also held by the two-thread holding portion h2. The holding force for holding the needle thread t by the second thread holding portion h2 (the urging force of the thread hook spring 6 that presses the needle thread t against the face plate 2b) is such that the needle thread t is held by the first thread holding portion h1. It is weaker than the holding force (the urging force of a torsion spring (not shown) that rotates the thread holding plate 24 toward the back surface portion 20d). That is, the needle thread t is more likely to come off from the second thread holding portion h2 than from the first thread holding portion h1.

その後レバー7が、図6(b)に示すように距離S3分、押し下げられると、それに伴う支持体20の下降によって第一カム部20jと第二カム部25cとが離間し、第一カム部20jと第二カム部25cとの連係が解除され、糸通し装置9は第二圧縮ばね27の付勢力によって針駆動装置8に向けて回転し接近する。ところで図3を参照しながら説明した、支持体20の糸通し側位置決め部20kと針棒支持体11の針駆動装置側位置決め部11cは、図6(b)に示すように、糸通し装置9が針駆動装置8に接近した際に当接するものであって、これにより接近した糸通し装置9と針駆動装置8とを、所定の位置関係で連結させることができる。また、糸通し装置9の回転によって、第一糸保持部h1に保持されている上糸tは、針5の近傍へ案内される。この状態において、第一糸保持部h1で保持された上糸tの水平部t1は、針5に対して直交する向きで針5の手前側に位置することになる。ところで、図6(a)に示した上糸tにおける針棒糸掛け部4から糸掛けばね6までの経路は、図6(b)では支持体20が下降するために下方に向けて大きく湾曲することになる。すなわち、針棒糸掛け部4から糸掛けばね6までの間で必要となる糸量が増加し、その増加した糸量を補うために糸駒sが位置する側と糸掛けばね6が位置する側の両方から糸が引出されることになる。ここで、糸駒sが位置する側では、糸駒sの糸量が豊富であるために上糸tが引出される。一方、糸掛けばね6が位置する側では残糸が短くなっていて、また第二糸保持部h2で上糸tを保持する保持力は、第一糸保持部h1で上糸tを保持する保持力よりも弱くなっている。従って、図6(a)の状態において第一糸保持部h1と第二糸保持部h2の両方で保持されていた上糸tは、図6(b)の状態では、第二糸保持部h2の保持から解放され、第一糸保持部h1によってのみ保持されることになる。 After that, when the lever 7 is pushed down for a distance S3 minutes as shown in FIG. 6B, the first cam portion 20j and the second cam portion 25c are separated by the accompanying lowering of the support 20, and the first cam portion is separated. The linkage between the 20j and the second cam portion 25c is released, and the threading device 9 rotates toward and approaches the needle driving device 8 by the urging force of the second compression spring 27. By the way, the threading side positioning portion 20k of the support body 20 and the needle drive device side positioning portion 11c of the needle bar support 11 described with reference to FIG. 3 are the threading device 9 as shown in FIG. 6 (b). Comes into contact with the needle drive device 8 when the needle drive device 8 is approached, whereby the threading device 9 and the needle drive device 8 that are close to each other can be connected in a predetermined positional relationship. Further, the rotation of the threading device 9 guides the needle thread t held by the first thread holding portion h1 to the vicinity of the needle 5. In this state, the horizontal portion t1 of the needle thread t held by the first thread holding portion h1 is located on the front side of the needle 5 in a direction orthogonal to the needle 5. By the way, in FIG. 6B, the path from the needle bar thread hooking portion 4 to the thread hooking spring 6 in the needle thread t shown in FIG. 6A is greatly curved downward because the support 20 descends. Will be done. That is, the amount of thread required between the needle bar thread hooking portion 4 and the thread hooking spring 6 increases, and the side where the thread piece s is located and the thread hooking spring 6 are located to compensate for the increased thread amount. The thread will be pulled out from both sides. Here, on the side where the thread piece s is located, the needle thread t is pulled out because the thread amount of the thread piece s is abundant. On the other hand, the remaining thread is short on the side where the thread hook spring 6 is located, and the holding force for holding the needle thread t by the second thread holding portion h2 is such that the needle thread t is held by the first thread holding portion h1. It is weaker than the holding power. Therefore, the needle thread t held by both the first thread holding portion h1 and the second thread holding portion h2 in the state of FIG. 6A is the second thread holding portion h2 in the state of FIG. 6B. Will be released from the holding of the first yarn holding portion h1 and will be held only by the first yarn holding portion h1.

なお、図3に示した糸通し軸19の正面側糸通しピン19aは、図6(b)に示す状態において、カム孔20cの右側に位置していて、背面側糸通しピン19bは、糸通し位置決め板12の突出部12aよりも上方に位置している。また、糸通し体18を介して糸通し軸19の下端に設けられた糸通しフック17は、支持体20に対して離間した位置にある。そして支持体20は、下側軸受け部20bの下面と糸通し体18の上面との間に配置された第一圧縮ばね22によって上方に付勢されていて、下側軸受け部20bの上面と止め輪23が接する高さにある。 The front threading pin 19a of the threading shaft 19 shown in FIG. 3 is located on the right side of the cam hole 20c in the state shown in FIG. 6B, and the back threading pin 19b is a thread. It is located above the protruding portion 12a of the through positioning plate 12. Further, the threading hook 17 provided at the lower end of the threading shaft 19 via the threading body 18 is located at a position separated from the support 20. The support 20 is urged upward by a first compression spring 22 arranged between the lower surface of the lower bearing portion 20b and the upper surface of the threading body 18, and is fixed to the upper surface of the lower bearing portion 20b. It is at the height at which the ring 23 touches.

更にレバー7が押し下げられて、図7(a)に示すように距離S4に至る状態になると、第一糸保持部h1によって針5の近傍まで案内されていた上糸tは、針孔5aの近傍まで降下する。ところで、ここまで支持体20と連動して同量降下していた糸通し軸19は、図7(a)の上側の部分拡大図に示すように、背面側糸通しピン19bが糸通し位置決め板12の突出部12aに当接することによって、それ以降の降下が阻止される。なお、糸通し軸19の降下が阻止される位置は、糸通しフック17と針孔5aが上下方向で一致する位置関係となるように設定されている。一方、支持体20は、図7(a)の下側の部分拡大図に示すように、第一圧縮ばね22を押し縮めながら下方に移動することが可能である。このため支持体20は、糸通し軸19を残したままレバー7とともに降下するため、正面側糸通しピン19aに対してカム孔20cが相対的に下方に移動する(正面側糸通しピン19aに対してカム孔20cが下方向にずれる)ことになる。このときのずれ量を、図7(a)において距離I4で示す。またこの状態では、第一糸保持部h1も、糸通し軸19に固定された糸通しフック17に対して相対的に距離I4分、下方に移動する(第一糸保持部h1が糸通しフック17に対して下方向にずれる)ことになる。また、正面側糸通しピン19aに対してカム孔20cが相対的に下方に移動すると、カム孔20cの上側内面20c1が正面側糸通しピン19aに押し当たり、正面側糸通しピン19aが左側に移動するように糸通し軸19が回転する(上方から見た際に、糸通し軸19が時計回りに回転する)。従って、針5の背面側に位置する糸通しフック17が、針5に近づく向きに回転することになる。 When the lever 7 is further pushed down to reach the distance S4 as shown in FIG. 7A, the needle thread t guided to the vicinity of the needle 5 by the first thread holding portion h1 becomes the needle hole 5a. It descends to the vicinity. By the way, in the threading shaft 19 which has been lowered by the same amount in conjunction with the support 20 so far, the threading pin 19b on the back side is a threading positioning plate as shown in the upper partially enlarged view of FIG. 7A. By contacting the protruding portion 12a of 12, the subsequent descent is prevented. The position at which the threading shaft 19 is prevented from descending is set so that the threading hook 17 and the needle hole 5a have a positional relationship in which they coincide with each other in the vertical direction. On the other hand, the support 20 can move downward while compressing the first compression spring 22, as shown in the lower partially enlarged view of FIG. 7A. Therefore, since the support 20 descends together with the lever 7 while leaving the threading shaft 19, the cam hole 20c moves downward relative to the front threading pin 19a (to the front threading pin 19a). On the other hand, the cam hole 20c is displaced downward). The amount of deviation at this time is shown by the distance I4 in FIG. 7A. Further, in this state, the first thread holding portion h1 also moves downward by a distance I4 minutes relative to the threading hook 17 fixed to the threading shaft 19 (the first thread holding portion h1 is the threading hook). It shifts downward with respect to 17). Further, when the cam hole 20c moves downward relative to the front threading pin 19a, the upper inner surface 20c1 of the cam hole 20c presses against the front threading pin 19a, and the front threading pin 19a moves to the left side. The threading shaft 19 rotates so as to move (when viewed from above, the threading shaft 19 rotates clockwise). Therefore, the threading hook 17 located on the back surface side of the needle 5 rotates in the direction approaching the needle 5.

図7(b)は、レバー7が距離S5まで押し下げられて支持体20が最下点に達した状態(支持体20が糸通し位置にある状態)を概略的に示している。レバー7とともに支持体20が降下することにより、針孔5aの近傍まで案内された上糸tは、針孔5aを越えて更に降下する。一方、支持体20の降下によって糸通し軸19は、カム孔20cの上側内面20c1が正面側糸通しピン19aに更に押し当たるため、更に時計回りに回転する。この回転によって、糸通しフック17が針孔5aを背面側から正面側に向けて通り抜け、更に支持体20に設けた挿通孔20h(図4(b)参照)へ挿入される。図7(b)に示す状態では、糸通しフック17に対して第一糸保持部h1は、相対的に距離I5分、下方に移動している(糸通しフック17に対して第一糸保持部h1が下方向にずれている)。またこの状態において、背面側糸通しピン19bは、突出部12aの根元側に設けられた溝部12bに入り込んでこれに嵌合する。 FIG. 7B schematically shows a state in which the lever 7 is pushed down to a distance S5 and the support 20 reaches the lowest point (a state in which the support 20 is in the threading position). As the support 20 descends together with the lever 7, the needle thread t guided to the vicinity of the needle hole 5a further descends beyond the needle hole 5a. On the other hand, the threading shaft 19 rotates further clockwise because the upper inner surface 20c1 of the cam hole 20c further presses against the front threading pin 19a due to the lowering of the support 20. By this rotation, the threading hook 17 passes through the needle hole 5a from the back side to the front side, and is further inserted into the insertion hole 20h (see FIG. 4B) provided in the support 20. In the state shown in FIG. 7B, the first thread holding portion h1 moves downward by a distance I5 minutes relative to the threading hook 17 (holding the first thread with respect to the threading hook 17). Part h1 is shifted downward). Further, in this state, the back threading pin 19b enters the groove portion 12b provided on the root side of the protruding portion 12a and fits into the groove portion 12b.

図8(a)は、レバー7を最下点まで押し下げた後に作業者がレバー7から手を放し、引張ばね26の付勢力によってレバー7が元の待機位置に向けて復帰する途中の状態(レバー7が距離S6にある状態)を概略的に示している。この状態においては、図3に示した引張ばね26の付勢力によってレバー7が上昇し、それに伴い支持体20も上昇する一方、糸通し軸19は、背面側糸通しピン19bが溝部12bに嵌合しているため、その高さで止まっている。このため、図7(b)では距離I5分あった糸通しフック17に対する第一糸保持部h1の上下方向のずれが一部解消され、図7(b)では上側内面20c1の近傍に位置していた正面側糸通しピン19aは、下側内面20c2の近傍に位置する。また、糸通し軸19は止まったままで支持体20のみが上昇するため、第一糸保持部h1に保持された上糸t(水平部t1)は糸通しフック17と交差し糸通しフック17に捕捉される。 FIG. 8A shows a state in which the operator releases the lever 7 after pushing down the lever 7 to the lowest point, and the lever 7 is being returned to the original standby position by the urging force of the tension spring 26 ( The state where the lever 7 is at the distance S6) is shown schematically. In this state, the lever 7 is raised by the urging force of the tension spring 26 shown in FIG. 3, and the support 20 is also raised accordingly, while the threading shaft 19 has the back threading pin 19b fitted in the groove 12b. Because it fits, it stops at that height. Therefore, in FIG. 7B, the vertical deviation of the first thread holding portion h1 with respect to the threading hook 17 having a distance of I5 minutes is partially eliminated, and in FIG. 7B, it is located near the upper inner surface 20c1. The front threading pin 19a that has been used is located in the vicinity of the lower inner surface 20c2. Further, since only the support 20 rises while the threading shaft 19 is stopped, the needle thread t (horizontal portion t1) held by the first thread holding portion h1 intersects the threading hook 17 and becomes the threading hook 17. Be captured.

図8(b)は、支持体20が図8(a)で示す位置よりも更に上昇した状態(レバー7が距離S7にある状態)を概略的に示している。支持体20の更なる上昇により、カム孔20cの下側内面20c2が正面側糸通しピン19aに押し当たり、図8(a)で示した状態に対して、正面側糸通しピン19aが正面視で右側に移動するように糸通し軸19が回転する(上方から見た際に、糸通し軸19が反時計回りに回転する)。従って、背面側糸通しピン19bが溝部12bから抜け出し、糸通し軸19は支持体20と連動して上昇し始めるため、糸通しフック17に対する第一糸保持部h1の上下方向のずれが解消されていく。また糸通し軸19が反時計回りに回転するため、糸通しフック17もこの方向に回転して針孔5aから引き抜かれる。ここで糸通しフック17には上糸tが掛けられているため、上糸tは糸通しフック17に糸掛けされた状態のまま正面側から背面側に向けて針孔5aから引き抜かれることで針孔5aに上糸tが挿通される。 FIG. 8B schematically shows a state in which the support 20 is further raised from the position shown in FIG. 8A (a state in which the lever 7 is at a distance S7). As the support 20 is further raised, the lower inner surface 20c2 of the cam hole 20c presses against the front threading pin 19a, and the front threading pin 19a is viewed from the front with respect to the state shown in FIG. 8A. The threading shaft 19 rotates so as to move to the right side (when viewed from above, the threading shaft 19 rotates counterclockwise). Therefore, the back threading pin 19b comes out of the groove 12b, and the threading shaft 19 starts to rise in conjunction with the support 20, so that the vertical deviation of the first thread holding portion h1 with respect to the threading hook 17 is eliminated. To go. Further, since the threading shaft 19 rotates counterclockwise, the threading hook 17 also rotates in this direction and is pulled out from the needle hole 5a. Here, since the needle thread t is hung on the threading hook 17, the needle thread t is pulled out from the needle hole 5a from the front side to the back side while being threaded on the threading hook 17. The needle thread t is inserted into the needle hole 5a.

支持体20が更に上昇して、レバー7が図9(a)に示す距離S8に至る状態においては、支持体20の第一カム部20jが第二カム部25cに接触してこれに乗り上げるため、糸通し側位置決め部20kと針駆動装置側位置決め部11cとが離反し、糸通し装置9は軸16を中心に針駆動装置8から離れる向きに回転する。この回転に伴い、支持体20は針5に対して上昇し且つ離れる向きに移動するため、糸通しフック17と第一糸保持部h1の間の上糸tは、針孔5aを屈曲点にして大きく屈曲する。すなわち、糸通しフック17から第一糸保持部h1までの間で必要となる糸量が増加する。一方、第一糸保持部h1においては、支持体20の上昇に伴い、糸保持板24の凸部24bが再び支持体台部21に当接するため、糸保持板24が付勢された方向とは逆方向に回転し、先端部24aと背面部20dとの間には隙間が生じる。つまり、糸保持板24が開放状態となり、上糸tの保持が解除される。従って、上糸tが第一糸保持部h1から外れることになる。 In a state where the support 20 is further raised and the lever 7 reaches the distance S8 shown in FIG. 9A, the first cam portion 20j of the support 20 comes into contact with the second cam portion 25c and rides on the second cam portion 25c. The threading side positioning unit 20k and the needle driving device side positioning unit 11c are separated from each other, and the threading device 9 rotates around the shaft 16 in a direction away from the needle driving device 8. With this rotation, the support 20 moves in a direction that rises and separates from the needle 5, so that the needle thread t between the threading hook 17 and the first thread holding portion h1 has the needle hole 5a as a bending point. It bends greatly. That is, the amount of thread required between the threading hook 17 and the first thread holding portion h1 increases. On the other hand, in the first thread holding portion h1, as the support 20 rises, the convex portion 24b of the thread holding plate 24 comes into contact with the support base portion 21 again, so that the direction in which the thread holding plate 24 is urged Rotates in the opposite direction, and a gap is created between the front end portion 24a and the back surface portion 20d. That is, the thread holding plate 24 is opened, and the holding of the needle thread t is released. Therefore, the needle thread t comes off from the first thread holding portion h1.

図9(b)は、図9(a)に示す状態から支持体20が更に上昇して待機位置まで復帰した状態を概略的に示している。支持体20の更なる上昇により、糸通しフック17は、第一糸保持部h1が位置する側の上糸tを更に引き上げて、上糸tの端部を含め残糸が全て針孔5aを通過する。その後の糸通しフック17の上昇に伴い、糸通しフック17からも上糸tが外れて糸通し作業が完了する。 FIG. 9B schematically shows a state in which the support 20 is further raised from the state shown in FIG. 9A and returned to the standby position. As the support 20 is further raised, the threading hook 17 further pulls up the needle thread t on the side where the first thread holding portion h1 is located, and all the remaining threads including the end of the needle thread t fill the needle hole 5a. pass. As the threading hook 17 rises thereafter, the needle thread t also comes off from the threading hook 17, and the threading operation is completed.

このように本実施形態のミシン1によれば、レバー7を押し下げるだけの簡単な操作で糸通し作業を行うことができる。また糸通し装置9は、図9(b)に示すように待機位置では、第一カム部20jが第二カム部25cに当接していて、針駆動装置8から離間した状態にある。すなわち、ジグザグ縫いのように縫製中に針駆動装置8が軸16を中心に左右に揺動運動する場合でも、糸通し装置9は連動することがないため、騒音や振動を抑制することができる。また、糸通しの準備段階の糸掛け動作において、糸通し装置9の第一糸保持部h1に糸を掛ける必要が無いため、不使用状態における糸通し装置の待機位置をミシンカバー内部に設けることができる。つまり、ミシンの縫製中における針周辺の状態が視認しやすく作業が行いやすくなる。 As described above, according to the sewing machine 1 of the present embodiment, the threading operation can be performed by a simple operation of pushing down the lever 7. Further, as shown in FIG. 9B, the threading device 9 is in a state where the first cam portion 20j is in contact with the second cam portion 25c and is separated from the needle driving device 8 at the standby position. That is, even when the needle driving device 8 swings left and right around the shaft 16 during sewing as in zigzag sewing, the threading device 9 does not interlock, so noise and vibration can be suppressed. .. Further, since it is not necessary to hook the thread on the first thread holding portion h1 of the threading device 9 in the threading operation in the threading preparation stage, the standby position of the threading device in the unused state is provided inside the sewing machine cover. Can be done. That is, the state around the needle during sewing of the sewing machine can be easily visually recognized, and the work can be easily performed.

以上、本発明の一実施形態について説明したが、本発明は係る特定の実施形態に限定されるものではなく、上記の説明で特に限定しない限り、特許請求の範囲に記載された本発明の趣旨の範囲内において、種々の変形・変更が可能である。また、上記の実施形態における効果は、本発明から生じる効果を例示したに過ぎず、本発明による効果が上記の効果に限定されることを意味するものではない。 Although one embodiment of the present invention has been described above, the present invention is not limited to the specific embodiment, and unless otherwise specified in the above description, the gist of the present invention described in the claims. Various modifications and changes are possible within the range of. In addition, the effects in the above embodiments merely exemplify the effects arising from the present invention, and do not mean that the effects according to the present invention are limited to the above effects.

例えば本実施形態では、水平部t1を形成しつつ上糸を確実に捕捉・保持できるよう、第一糸保持部h1の構成を、背面部20d、糸掛けアーム20e、糸保持溝20f、及び糸保持板24としていたが、別の構成であっても良い。水平部t1を形成しつつ上糸を捕捉・保持するためには上糸を少なくとも2点で支持できれば良く、例えば、糸保持板24(背面部20d)、糸掛けアーム20eという構成であっても構わない。 For example, in the present embodiment, the configuration of the first yarn holding portion h1 is changed to the back surface portion 20d, the thread hook arm 20e, the thread holding groove 20f, and the thread so that the needle thread can be reliably captured and held while forming the horizontal portion t1. Although it was the holding plate 24, it may have a different configuration. In order to capture and hold the needle thread while forming the horizontal portion t1, it is sufficient that the needle thread can be supported at at least two points. I do not care.

また、本実施形態では、第二糸保持部h2はミシンカバーである面板2bに設けられているが、第二糸保持部h2がミシン外部に露出していれば良く、設けられている部材を限定するものではない。したがって、例えばミシンアームの一部がミシンの外部に表出しているのであれば、そのミシンアームの表出部に第二糸保持部h2を設けても良い。 Further, in the present embodiment, the second thread holding portion h2 is provided on the face plate 2b which is the sewing machine cover, but it is sufficient that the second thread holding portion h2 is exposed to the outside of the sewing machine. It is not limited. Therefore, for example, if a part of the sewing machine arm is exposed to the outside of the sewing machine, the second thread holding portion h2 may be provided on the exposed portion of the sewing machine arm.

また本実施形態では、図1に示すようにレバー7の押圧部7aが面板2bの下側から露出しているが、他の場所から露出するように構成してもよい。例えば面板2bの左側側面においてレバー7が上下方向に移動可能な孔を設け、押圧部7aはその孔の外側で露出するように構成してもよい。この場合は、面板2bの下側におけるスペースがより広くなって視認性がより高まるという利点がある。また、図1に示した本実施形態では糸通し装置9の一部が面板2bの下面から露出するように構成されているが、これに限定されず、糸通し装置9が完全に面板2bの内部に収納される位置に待機位置があっても構わない。 Further, in the present embodiment, as shown in FIG. 1, the pressing portion 7a of the lever 7 is exposed from the lower side of the face plate 2b, but it may be configured to be exposed from another place. For example, the left side surface of the face plate 2b may be provided with a hole through which the lever 7 can move in the vertical direction, and the pressing portion 7a may be configured to be exposed outside the hole. In this case, there is an advantage that the space under the face plate 2b becomes wider and the visibility is further improved. Further, in the present embodiment shown in FIG. 1, a part of the threading device 9 is configured to be exposed from the lower surface of the face plate 2b, but the threading device 9 is completely covered with the face plate 2b. There may be a standby position at the position where it is stored inside.

本実施形態のミシン1は、糸通し作業を片手で行えるように構成したものであったが、上記特許文献1に示されるような糸通し作業を両手で行うように構成されたミシンに上記の技術を適用して本発明を具現化してもよい。また本実施形態のミシン1は、針駆動装置8と糸通し装置9とが分離するものであるのに対し、特許文献2に示されたミシンは、同文献の図2に示されているように、針駆動装置と糸通し装置とが一体的に構成されている(針を上下動させる針棒上下動機構(13)に対して糸通しを行うフック(32)を駆動させる機構が一体的に組み込まれている)点で相違するものであるが、このような特許文献2の如きミシンであっても、上記の技術を適用して本発明を具現化することが可能である。つまり、本実施形態では、糸通し装置9のスライド駆動により第一糸保持部h1が上糸tを補足・保持した後、上糸tの水平部t1を針孔5aに向けて移動させるため、第一糸保持部h1を回動させる回動部として針駆動装置8を回転させる軸16を利用していたが、軸16とは別の軸を利用してこの移動を実現させることもできる。例えば、特許文献2に示されたミシンのように、軸16とは別の軸を回動部の回転軸とし、第一糸保持部h1がZ方向を回転軸として回転するように構成して、水平部t1を針孔5aに向けて移動させてもよい。 The sewing machine 1 of the present embodiment is configured so that the threading operation can be performed with one hand. However, the sewing machine 1 described above is a sewing machine configured to perform the threading operation with both hands as shown in Patent Document 1. The present invention may be embodied by applying the technique. Further, in the sewing machine 1 of the present embodiment, the needle driving device 8 and the threading device 9 are separated, whereas the sewing machine shown in Patent Document 2 is as shown in FIG. 2 of the same document. In addition, the needle drive device and the threading device are integrally configured (the mechanism for driving the hook (32) for threading the needle bar vertical movement mechanism (13) for moving the needle up and down is integrated. Although it differs in that it is incorporated in (incorporated in), it is possible to embody the present invention by applying the above technique even with such a sewing machine as in Patent Document 2. That is, in the present embodiment, after the first thread holding portion h1 captures and holds the needle thread t by the slide drive of the threading device 9, the horizontal portion t1 of the needle thread t is moved toward the needle hole 5a. Although the shaft 16 for rotating the needle driving device 8 was used as the rotating portion for rotating the first thread holding portion h1, this movement can be realized by using a shaft different from the shaft 16. For example, as in the sewing machine shown in Patent Document 2, a shaft different from the shaft 16 is used as the rotation axis of the rotating portion, and the first thread holding portion h1 is configured to rotate with the Z direction as the rotation axis. , The horizontal portion t1 may be moved toward the needle hole 5a.

また本実施形態のミシン1は、作業者がレバー7を押し下げることによって糸通し装置を作動させる所謂手動式の糸通し装置を備えるものであったが、これに限られず、例えばレバー7による構成に替えて、モータによって糸通し装置を作動させるようにしてもよい。 Further, the sewing machine 1 of the present embodiment includes a so-called manual threading device in which an operator operates the threading device by pushing down the lever 7, but the sewing machine 1 is not limited to this, and the sewing machine 1 is not limited to this. Alternatively, the threading device may be operated by a motor.

1:ミシン
2:ミシンカバー(カバー)
2b:面板(第二糸保持部)
5:針
5a:針孔
6:糸掛けばね(第二糸保持部)
16:軸(回動部)
17:糸通しフック
20:支持体
24:糸保持板(第一糸保持体)
h1:第一糸保持部
h2:第二糸保持部
t:上糸
t1:水平部
1: Sewing machine 2: Sewing machine cover (cover)
2b: Face plate (second thread holding part)
5: Needle 5a: Needle hole 6: Thread hook spring (second thread holding portion)
16: Shaft (rotating part)
17: Threading hook 20: Support 24: Thread holding plate (first thread holding body)
h1: First thread holding part h2: Second thread holding part t: Upper thread t1: Horizontal part

Claims (5)

針の先端に設けられた針孔に向けて下降しつつ当該針孔の一方側と他方側からそれぞれ接近する第一糸保持部と糸通しフックとを備え、当該糸通しフックが当該針孔を挿通し、当該針孔に接近した当該第一糸保持部が保持する上糸を捕捉することによって、当該上糸を当該針孔へ挿通させる糸通し装置を備えるミシンであって、
前記糸通し装置を覆うカバーに設けられ、糸通し準備段階において前記上糸を保持する第二糸保持部を備え、
前記第一糸保持部は、前記糸通し準備段階において前記上糸を保持しておらず、前記糸通し装置が下降する途中において、前記上糸を保持するとともに前記第二糸保持部から当該上糸を解放することを特徴とするミシン。
It is provided with a first thread holding portion and a threading hook that approach each other from one side and the other side of the needle hole while descending toward the needle hole provided at the tip of the needle, and the threading hook holds the needle hole. A sewing machine including a threading device for inserting the needle thread into the needle hole by inserting the needle thread and capturing the needle thread held by the first thread holding portion approaching the needle hole.
A second thread holding portion provided on a cover covering the threading device and holding the needle thread in the threading preparation stage is provided.
The first thread holding portion does not hold the needle thread in the threading preparation stage, and while the threading device is descending, holds the needle thread and from the second thread holding portion to the upper thread. A sewing machine characterized by releasing threads.
前記第一糸保持部は、支持体と、該支持体から離間する開放状態と該支持体に接近して前記上糸を挟持可能な挟持状態とに変位する第一糸保持体を備え、
前記第一糸保持体は、前記糸通し装置の下降に伴い前記開放状態から前記挟持状態へ変位することを特徴とする請求項1に記載のミシン。
The first thread holding portion includes a support and a first thread holder that is displaced into an open state separated from the support and a holding state approaching the support so that the needle thread can be sandwiched.
The sewing machine according to claim 1, wherein the first thread holder is displaced from the open state to the sandwiched state as the threading device is lowered.
前記第一糸保持部は、前記糸通し装置の下降に伴い前記上糸に接触する糸掛けアームを備え、
前記糸掛けアームと前記挟持状態へ変位した前記第一糸保持体とが協働して前記上糸に水平部を形成することを特徴とする請求項2に記載のミシン。
The first thread holding portion includes a thread hook arm that comes into contact with the needle thread as the threading device descends.
The sewing machine according to claim 2, wherein the thread hook arm and the first thread holder displaced to the holding state cooperate to form a horizontal portion on the needle thread.
前記糸通し装置は、前記第一糸保持部を回動させる回動部を備え、
前記第一糸保持部を下降且つ回動させることによって、前記水平部を前記針孔に対向する位置に移動させることを特徴とする請求項3に記載のミシン。
The threading device includes a rotating portion for rotating the first thread holding portion.
The sewing machine according to claim 3, wherein the horizontal portion is moved to a position facing the needle hole by lowering and rotating the first thread holding portion.
前記第二糸保持部が前記上糸を保持する保持力は、前記第一糸保持部が当該上糸を保持する保持力よりも弱く設定されていることを特徴とする請求項1〜4の何れか一項に記載のミシン。 The holding force of the second thread holding portion for holding the needle thread is set to be weaker than the holding force of the first thread holding portion for holding the needle thread, according to claims 1 to 4. The sewing machine according to any one item.
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